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2 years ago

Michele correctly solved a quadratic equation using the quadratic formula as shown below.

Mathematics

1 answer:

ra1l [238]2 years ago

8 0

Whats the answers it doesn’t show for me

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Please help me figure this out! Thank you so much :( i really need it! ❤️

Hoochie [10]

Answer:

$\textbf{A. }x=2i\text{ or }x=-2i\\\\\textbf{B. }(x+2i)(x-2i)$

Step-by-step explanation:

The quadratic can be solved in a straightforward way:

$x^2+4=0\\\\x^2=-4\qquad\text{subtract 4}\\\\x=\pm\sqrt{-4}\qquad\text{take the square root}\\\\x=\pm2i\qquad\text{simplify}$

This tells you that the solutions are ...

2i or -2i

For each root of "a", (x -a) is a factor. Thus the factors of the equation are ...

(x +2i)(x -2i)

8 0

2 years ago

Cheese pizzas cost $7 and pepperoni pizzas cost $9. You order a total of 40 pizzas and the bill is $310. How many of each pizza

Anon25 [30]

Answer: cheese pizzas = 25 , Pepperoni pizzas = 15

Step-by-step explanation:

Let x = Number of cheese pizzas, y = Number of pepperoni pizzas.

As per given,

$x+y=40\ \ \ (i)\\\\ 7x+9y=310\ \ \ (ii)$

Multiply 7 on both sides of (i), we get

$7x+7y=280\ \ \ (iii)$

Eliminate (iii) from (ii), we get

$2y= 30\\\\\Rightarrow\ y=15$

Put value of y in (i) , $x+15=40\Rightarrow\ x= 40-15= 25$

Hence, cheese pizzas = 25 , Pepperoni pizzas = 15

8 0

3 years ago

Find the domain and range of the function:<br> f(t)=sec[((pi)t)/4]

beks73 [17]

The domain and range of the function f(t)=sec[((pi)t)/4] are the following:

<span>Domain: All the real numbers except t = 2 + 4k, where k is an integer. </span>

Range: (-∞, -1] U [1, ∞)

I am hoping that these answers have satisfied your queries and it will be able to help you in your endeavors, and if you would like, feel free to ask another question.

3 0

3 years ago

The rectangle below has a area x^2-x-72 square meters and a length of x+8 meters what expression represents the width of the rec

mixer [17]

ANSWER

$w = (x - 8)$

EXPLANATION

The given rectangle has area,

$A = {x}^{2} - x - 72 \: {m}^{2}$

It was given to us that, the length of the rectangle is l=(x+8)

To find the width, we need to factor, the expression for the area.

We split the middle term to get,

$A = {x}^{2} - 9x + 8x- 72$

We now factor by grouping;

$A = x(x - 9) + 8(x- 9)$

$A = (x + 8)(x - 9)$

We know that area of a rectangle is

$A = l \times w$

Hence the width of the rectangle is,

$w = (x - 8)$

8 0

3 years ago

Read 2 more answers

Look at this equation 3(x+1)=3x=? which number can be placed in the box *the question mark* that would create an equation that h

KATRIN_1 [288]

The answer to this is 0

8 0

3 years ago